Dual Electromagnetic Retarder Control System for Tuning Internal Combustion Engines

A preliminary analysis and synthesis of structural, functional diagrams of the control system of two electromagnetic retarders connected to the driving wheels of the car, to ensure the adjustment of the fuel system of the internal combustion engine, was performed. When developing the system, the mechanical connection of the wheels through the gearbox and the differential bridge was taken into account. For precise adjustment of the ignition timing and fuel mixture composition, the control system of electromagnetic retarders must operate in two modes - start to the desired speed of the internal combustion engine with simultaneous rotation of both wheels with a minimum total load torque and stabilize this speed throughout the gas pedal position range. It is shown that to solve the task, the control system can be built both with two PI-wheel speed controllers with a common master signal, and with a more complex dual 2-circuit system with current and speed control. Also, taking into account the non-linear dependence of the torque of electromagnetic clutches on current and speed, fractional-integral regulators can be applied. The final decision on the regulatory structure will be made after testing the control system. In the future, we plan to upgrade the system for four-wheel drive cars.